Proving Advertising Lift with Bid-Level Data
Case Study — Incrementality Measurement

Proving a 10x Advertising Lift Using First-Party Bid Data

How we built a true control group from lost auctions to measure the causal impact of programmatic advertising — without models, surveys, or third-party data.

~10x
Conversion Lift
Households exposed to advertising converted at 0.098%, compared to just 0.010% for unexposed households within the same target audience — a lift of nearly ten times. Approximately 90% of conversions from the treatment group are directly attributable to ad exposure.

Side-by-Side Results

Control — Never Saw Ad
Households 80,287
Conversions 8
Conversion Rate 0.010%
Treatment — Saw Ad
Households 471,560
Conversions 461
Conversion Rate 0.098%
+878%
Relative Lift
~414
Incremental Conversions
90%
Ad-Attributable Share

The Challenge

Every advertiser asks the same question: is my advertising actually driving results, or are these people who would have converted anyway?

Traditional attribution tells you a conversion happened after someone saw an ad — but it can't tell you whether the ad caused it. That distinction matters, because without it, you're measuring correlation, not impact.

We set out to answer this definitively using a methodology most agencies don't have access to: first-party bid-level incrementality analysis.

The Approach

As a programmatic DSP operator, we have access to something unique — not just records of the ads we served, but records of every auction we entered, including the ones we lost. This creates a natural experiment with two groups drawn from the same targeting pool:

Treatment Group
Households where we entered a real-time auction, won, and served an ad. These are the people who actually saw the advertising.
Control Group
Households where we entered the same auctions but lost to a competing bidder. Same targeting profile, same inventory, same moment in time — the only difference is that our ad was never shown. Validated to have zero historical exposure to this advertiser's campaigns.

This isn't a modeled estimate. Both groups are real people, identified through first-party data, who participated in the same real-time auctions during the same period. The difference in conversion rates between these two groups is the true, measured lift created by the advertising.

Why This Matters

Most digital advertising measurement relies on attribution models that credit an ad whenever a conversion happens after exposure. But this can't distinguish between a customer who converted because of your ad and one who was already going to convert and simply happened to see it along the way.

Our incrementality approach measures the difference in outcomes between exposed and unexposed groups — the same methodology used by academic researchers and enterprise advertisers, now applied at the local and regional level using first-party programmatic data.

The result: a clear, defensible answer to the question "did my advertising work?" — grounded in observed behavior from a real control group, not assumptions or statistical projections.

What Makes This Possible

Bid-Level Log Data
Access to every auction entered — not just those won — creating a natural, unbiased control group of targeted-but-unexposed households.
First-Party Conversion Tracking
Deterministic matching between ad exposure and conversion events at the household level, without reliance on third-party cookies or modeled audiences.
Full-History Exposure Validation
Verification that control group households have never been exposed to the advertiser's campaigns at any point, eliminating prior-exposure contamination.
Transparent Methodology
No black-box models or proprietary algorithms. The analysis is fully reproducible from raw log-level data the advertiser can audit directly.

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